Posted by **Stuck** on Wednesday, May 5, 2010 at 10:29pm.

"In the expansion of (2-ax)^5 the coefficient of x^2 is 5. Find the value of a".

I know I have to use the binomial theorem to help me, but I don't know how.

- Never Mind! -
**Stuck**, Wednesday, May 5, 2010 at 10:35pm
I got it. :)

- Math - another question -
**Anonymous**, Wednesday, May 5, 2010 at 10:36pm
How did u get it?

- Math - another question -
**Stuck**, Wednesday, May 5, 2010 at 11:01pm
According to the binomial theorem, the term with x^2 would be the third term. I plugged my known values into the "formula" for the third term, and made it equal to 5. Then I solved for a. Sorry, my explanation is kind of vague.

- Math - another question -
**Anonymous**, Wednesday, May 5, 2010 at 11:05pm
Cool, I appreciate you responding to my question.

## Answer This Question

## Related Questions

- same type of binomial theorem question - Question: Find the first 3 terms in the...
- Integrated Math 1 - What is the coefficient of the xy^2 term in the expansion of...
- Math - Use the Binomial Theorem to determine the coefficient of x^14 in the ...
- Discrete math - I need to find the coefficient of x^18 y^32 in (x+y)^50. I ...
- maths-binomial theorem - coefficient of x^39 in the expansion of [(1/x^2) + x^4...
- Math - Use the Binomial Theorem to find the fifth term in the expansion (2x+3y)^...
- Algebra Binomial Theorem - Hi, can somebody help me with this math problem I am ...
- Math - Find the coefficient of x^2y^3 in the binomial expansion of (x-2y)^5.
- binomial theorem - find the 20th term in the expansion of (a+b)^22
- Algebra2/trig - Hi, I can't figure out what I'm supposed to do on this problem. ...

More Related Questions